# Posts by Yeneta

Total # Posts: 18

Chemistry
4 L of oxygen at a pressure of 400 Kpa and 1L of nitrogen at 200 Kpa were introduced in to 2 L vessel. (A)What is the total pressure of the gases in the vessel. (B)What is the mole fraction of each gas?

Chemistry
A solution contains 15 g non-volatile non-electrolyte solute C6H14O6 dissolved in 500 g of water at 40 c. Calculate (A)Vapor pressure of the solution. (B)Boiling point of the solution. (C)Freezing point of the solution.

Chemistry
H2SO4 solution containing 200.1 g of H2SO4 in 0.3500 L OF solution has a density of 1.3294 g/ml.calculate (A) Mass%H2SO4(m/m) (B)mass%H2O(m/m) (C)Molarity (D)Molality

Chemistry
H2SO4 solution containing 200.1 g of H2SO4 in 0.3500 L OF solution has a density of 1.3294 g/ml.calculate (A) Mass%H2SO4(m/m) (B)mass%H2O(m/m) (C)Molarity (D)Molality

Maths
If the dimension of a right rectangular prism are 7cm,9cm and 3cm,then find (A) Its total surface area (B) Its volume (C) the length of its diagonal

Educational psychology
Explean the chinese proverb "I hear and I forget;I see and I remember;I do and I understand",from instructional materials and active learning dimensions.

Chemistry
List three advantages and three disadvantages of improvised apparatus in teaching chemistry?

Chemistry
What is the reason that chemists chatagories Fe,Co and Ni in the same group VIIIB?

Chemistry
Distinguish between an absorption spectrum and an emission spectrum.with which did bohr work?

Chemistry
An electron in the n=5 level of an H atom emit a photon of wavelength 1281nm. To what energy level does the electron move? Thanks for ur help.

Chemistry
In what ways are microwave and ultraviolet radiation the same? In what ways are they different?

Chemistry
Which of the following is most likely to deviate from ideal ga7 behavior? (A)He (B)Ar (c) Cl2 (d) CCl2F2

Chemistry
The solubility of sodium selenate is 84 g/100 g of water at 35 oC. If a solution is obtained by dissolving 92 g of sodium selenate in 200 g of water at 35 oC, What do you call this solution? (A) Diluted (B) Saturated (C) Unsaturated (D) supersaturated

Chemistry
Why does a pressure cooker reduce cooking time?

Chemistry
2S2O3 2- + I2 => S4o6 2- + 2I - If,in an experiment,0.05 mol S2O3 2- is consumed in 1.0L of solution each second,at what rates are S4O6 2- and I- produced in this solution?

Chemistry
A reaction is 50% complete in 2 hours and 75% complete in 4 hours. What is the order of this reaction?

Chemistry
Which of ions most abondant in sea water Na+ ,Ca2+ ,Cl-,HCO3-

Chemistry
Which of the following is exothermic? A.boiling of water B.person growing C.choppening of tree D.freezing of water

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